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From: Stan Hoeppner (stanhardwarefreak.com)
Date: Wed Oct 27 2010 - 18:46:34 CDT
Неворотин Вадим put forth on 10/27/2010 10:51 AM:
> I can't add clients to whitelist because I don't know their addresses. One
> of our manager call to client with phone and say him email address. And in
> this case manager should receive a letter without greylisting, so in fact I
> need some method to pass greylisting, which manager could describe to
> client. The simplest way for manager and client is to add to mail subject
> some digital code, but I can't understand how to configure Postfix to
> support this method.
Will all these clients be sending to the same email address
yourcompany.tld upon this initial contact? If so, simply whitelist the
recipient address. There are many ways to skin this cat. The key is
that any anti-spam measures should always be 100% transparent to
senders. I.e. they shouldn't have to add something to the subject line
just to get their email through your server, or jump through any other
I use Postgrey here, and the most I've ever had to wait on greylist
delay after signing up for a new mailing list or placing an order with a
new company was a few minutes. If you can't whitelist in one form or
another, and a few minutes delay is too long for you, then you shouldn't
be using greylisting at all, as it's not a good fit for your needs.
> 2010/10/27 Stan Hoeppner <stanhardwarefreak.com>
>> Greylisting has but one purpose: stopping spam bots (zombies)
>> Are these new clients sending emails to you from zombies? No, of course
>> not. So simply whitelist their addresses or IPs in your greylist daemon
>> setup (not in Postfix). This is trivial to do with Postgrey, though I
>> don't know about other daemons.
>> Whitelisting in your greylist software is not the same as whitelisting
>> in Postfix. It only allows clients to bypass the greylisting step. Any
>> real MTA will retry, so if you _know_ it's a real MTA, which in this
>> case you do, whitelist it in your greylist config.